Ardnamurchan (/ˌɑːrdnəˈmɜːrxən/, Scottish Gaelic: Àird nam Murchan [aːrˠʃtʲ nə ˈmuɾuxan]) is a 50-square-mile (130-square-kilometre) peninsula in the ward management area of Lochaber, Highland, Scotland, noted for being very unspoiled and undisturbed.

Strictly speaking, Ardnamurchan covers only the peninsula beyond the villages of Salen (in the south) and Acharacle (in the north), but nowadays the term is also used more generally to include the neighbouring districts of Sunart, Ardgour, Morvern, and even Moidart[citation needed] (which was part of the former county of Inverness-shire, not Argyll).

The north western corner of Ardnamurchan consists of a lopolith (previously interpreted as a ring dyke) that has been exposed at the surface.

At least seven other similar complexes of the same tectonic episode exist along the west coast of Britain, and these are popular sites for many university geological training courses.

Adomnan of Iona records St Columba visiting the peninsula in the 6th century, and gives the impression that it was settled by Irish Gaels at that time.

The Ardnamurchan Viking was found buried with an axe, a sword with a decorated hilt, a spear, a shield boss and a bronze ring pin.

Other finds in the 5-metre-long (16-foot) grave in Ardnamurchan included a knife, what could be the tip of a bronze drinking horn, a whetstone from Norway, a ring pin from Ireland and Viking Age pottery.

The peninsula is also home to an annual Mòd, an eisteddfod-like festival and series of contests celebrating the Gaelic language, its culture, music, and literature.

Dr John MacLachlan, the author of Dìreadh a-mach ri Beinn Shianta, a poem on the Ardnamurchan Clearances, is unusual for his outspoken criticism of the Anglo-Scottish landlords responsible for the evictions.